Alert archive / Florida / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 12, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at May 21, 1986, 4:50 PM EDT for Broward County, Miami-Dade County, Florida. It was in force for 70 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 21, 1986, 4:50 PM EDT (20:50 UTC)
- Expired
- May 21, 1986, 6:00 PM EDT
- In force
- 70 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
Counties Broward County, FL, Miami-Dade County, FL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 21, 5:45 PM EDT | Hail 1 | Miami-Dade, FL | |
| May 21, 5:50 PM EDT | Hail 1 | Miami-Dade, FL |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Key West, FL (KEYW), launched 12:00Z, 8.8 hours before the alert went out and 193 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1331 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1019 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMIA 212050 SVRMIA FLC011-025-212200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING NATIONAL WEATHER SERVICE MIAMI FL 450 PM EDT WED MAY 21 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING EFFECTIVE UNTIL 600 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHEAST FLORIDA...BROWARD AND DADE ...THIS WARNING ALSO INCLUDES THE ADJACENT COASTAL WATERS FOR THE COUNTIES JUST MENTIONED THUNDERSTORM ACTIVITY WAS INTENSIFYING RAPIDLY OVER WESTERN PORTIONS OF BROWARD AND DADE COUNTIES DURING THIS EVENING RUSH HOUR PERIOD. NATIONAL WEATHER SERVICE RADAR AT 445 PM SHOWED SEVERAL THUNDERSTORMS...THE STRONGEST OF WHICH WERE OVER NORTHWEST DADE AND SOUTHWEST BROWARD COUNTIES...THAT ARE BECOMING SEVERE AND WILL LIKELY PRODUCE STRONG WIND GUSTS..HAIL..HEAVY RAIN.. AND FREQUENT LIGHTNING. DADE AND BROWARD COUNTIES AND ADJACENT AREAS OF SOUTH FLORIDA ALSO REMAIN UNDER A SEVERE THUNDERSTORM WATCH UNTIL 7PM. THIS MEANS THAT OTHER SEVERE STORMS ARE LIKE TO DEVELOP THIS EVENING. RESIDENTS...EVENING RUSH HOUR COMMUTERS...AND BOATERS ALONG DADE AND BROWARD COASTAL WATERS SHOULD TAKE ACTION TO AVOID THESE STORMS. IF THREATENING WEATHER APPROACHES YOU SHOULD GO TO A SAFE PLACE IMMEDIATELY..AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER SERVICE OFFICE.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 21, 1:31 PM EDT, 3 hours 19 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 130 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM. AT 130 PM NO SEVERE WEATHER HAS OCCURRED OVER SOUTH FLORIDA. SCATTERED VERY HEAVY THUNDERSTORMS WERE INCREASING FROM BETWEEN MELBOURNE AND VERO BEACH SOUTHWEST TO VENICE. A FEW VERY HEAVY THUNDERSTORMS HAD FORMED FROM THE SOUTH PART OF LAKE OKEECHOBEE TO NEAR IMMOKALEE. THE STORMS *WERE MOVING EAST AT 25 MILES AN HOUR.
Special weather statement, May 21, 1:49 PM EDT, 3 hours 1 minute before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 145 PM EDT WED MAY 21 1986 AT 145 PM EDT RADAR INDICATES AN AREA OF THUNDERSTORMS ARE DEVLOPING RAPIDLY OVER THE NORTHEASTERN PART OF HENDRY CO1UNTY. THESE STORMS WERE MOVING EAST NORTHEAST ABOUT 25 MPH TOWARDS CLEWISTON FLORIDA AND WILL PRODUCE HEAVY RAIN..STRONG GUSTY WINDS ..FREQUENT LIGHTNING STRIKES AND POSSIBLE HAIL IN THE EFFECTED AREA WITHIN THE NEXT HOUR OR TWO.
Special weather statement, May 21, 2:30 PM EDT, 2 hours 20 minutes before
^MIASPSPBI SEVERE WEATHER AND MARINE STATEMENT NATIONAL WEATHER SERVICE WEST PALM BEACH FL 230PM EDT WED MAY 21 1986 THE SEVERE THUNDERSTORM WATCH EFFECTIVE UNTILL 7PM EDT FOR A LARGE PORTION OF SOUTH AND CENTRAL FLORIDA INCLUDING PALM BEACH...MARTIN...ST LUCIE AND OKECHOBEE COUNTIES THEIR COASTAL WATERS AS WELL AS LAKE OKECHOBEE CONTINUES IN EFFECT. A SEVERE THUNDERSTORM WARNING AND SPECIAL MARINE WARNING IS IN EFFECT FOR WESTERN PALM BEACH AND MORTIN COUNTIES AS WELL AS LAKE OKEECHOBEE UNTILL 345PM. AT 230PM RADAR INDICATES SEVERE THUNDERSTORMS OVER SOUTHERN LAKE OKEECHOBEE AND HEAVY THUNDERSTORMS OVER NORTHERN OKECHOBEE COUNTY MOVING TOWARD THE EAST NORTHEAST AROUND 20 MPH. IF THREATENING WETHER APPROACHES TAKE COVER OR SEEK SAFE HARBOUR IMMEDIATELY. NO REPORTS OF SEVERE WEATHER HAVE BEEN RECEIVED SO FAR..HOWEVER TO REPORT SEVERE WEATHER NOTIFY YOUR NEAREST LAW ENFORCEMENT AGENCY OR CIVIL DEFENSE OFFICE. REMEMBESR..A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS. LISTEN TO YOUR LOCAL RADIO OR TV STATION OR NOAA WEATHER RADIO FOR FURTHER STATEMENTS OR WARNINGS..WHICH WILL BE ISSUED IF CONDITIONS WARRANT.
Special weather statement, May 21, 2:33 PM EDT, 2 hours 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 234 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES OF SOUTH FLORIDA...GLADES HENDRY COLLIER MAINLAND MONROE BROWARD DADE AND THE ADJACENT COASTAL WATERS. AT 234 PM NO SEVERE WEATHER HAS OCCURRED OVER SOUTH FLORIDA. SCATTERED VERY HEAVY THUNDERSTORMS CONTINUED FROM SOUTH OF LAKE OKEECHOBEE NORTH TO SEBRING. THE TAREA EXTENDED TO NEAR THE EAST COAST. THE HEAVIEST STORMS CONTINUED IN NORTHEAST HENDRY COUNTY. THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR.
Special weather statement, May 21, 3:37 PM EDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 335 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES OF SOUTH FLORIDA...GLADES HENDRY COLLIER MAINLAND MONROE BROWARD DADE AND THE ADJACENT COASTAL WATERS. AT 335 PM NO SEVERE WEATHER HAS OCCURRED OVER SOUTH FLORIDA. SCATTERED VERY HEAVY THUNDERSTORMS WERE INCREASING FROM VERO BEACH AND JUPITER TO JUST SOUTH OF L}AKE OKEECHOBEE. A FEW VERY HEAVY THUNDERSTORMS HAD FORMED IN NORTHWEST DADE COUNTY. THE STORMS WERE MOVING EAST AT 25 MILES AN HOUR.
Special weather statement, May 21, 4:35 PM EDT, 15 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MIAMI FL 428 PM EDT WED MAY 21 1986 SEVERE THUNDERSTORM WATCH 204 IS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES OF SOUTH FLORIDA...GLADES HENDRY COLLIER MAINLAND MONROE BROWARD DADE AND THE ADJACENT COASTAL WATERS. AT 428 PM CLUSTERS OF VERY HEAVY THUNDERSTORMS...EMBEDDED IN LARGE AREAS OF RAIN...CONTINUED OVER MOST OF THE EASTERN PENINSULA FROM INDIAN RIVER COUNTY TO DADE COUNTY. THIS ACTIVITY EXTENDED INTO THE IMMEDIATE OFF- SHORE WATERS. THESE THUNDERSTORMS WERE MOVING TO THE EAST AT 20 MILES AN HOUR.
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 9:48 PM EDT | Severe Thunderstorm Warning | MFL | Broward | 57 min |
| May 20, 10:42 PM EDT | Severe Thunderstorm Warning | MFL | Broward, Miami-Dade | 63 min |
| May 21, 6:06 PM EDT | Severe Thunderstorm Warning | MFL | Broward, Miami-Dade | 54 min |
| May 21, 6:59 PM EDT | Severe Thunderstorm Warning | MFL | Broward, Miami-Dade | 61 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1986Every severe thunderstorm warning in 1986
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.